B737-300 first officer reported encountering wake turbulence on arrival to lax that resulted in a 45...

Attributes
ACN	1131566
Time
Date	201311
Local Time Of Day	1201-1800
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR SADDE
Flight Plan	IFR
Aircraft 2
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 198 Flight Crew Type 6000
Person 2
Function	Captain
Experience	Flight Crew Last 90 Days 187 Flight Crew Type 12000
Events
Anomaly	Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter

Narrative:

We were on the sadde arrival passing over smo VOR at 7;000 ft MSL. The aircraft began a roll to the left with the autopilot engaged. At approximately 30-40 degrees of bank; I disconnected the autopilot. The roll continued to 45 degrees. I was able to bring the wings level and recover. There was an altitude loss of 400-600 ft from our assigned altitude during recovery. We notified ATC of a possible wake turbulence encounter and altitude deviation. We were following a boeing 767 on the arrival; however; we were well above their glide path. The wind at altitude was almost calm. I don't know how this could have been prevented. I believe the wake was from another aircraft. It would be almost impossible for it to be the preceding aircraft. The calm winds and topography may have allowed wake to remain in place longer than normal from another airplane ahead of the B767 we were following.

Original NASA ASRS Text

Title: B737-300 First Officer reported encountering wake turbulence on arrival to LAX that resulted in a 45 degree roll.

Narrative: We were on the SADDE Arrival passing over SMO VOR at 7;000 FT MSL. The aircraft began a roll to the left with the autopilot engaged. At approximately 30-40 degrees of bank; I disconnected the autopilot. The roll continued to 45 degrees. I was able to bring the wings level and recover. There was an altitude loss of 400-600 FT from our assigned altitude during recovery. We notified ATC of a possible wake turbulence encounter and altitude deviation. We were following a Boeing 767 on the arrival; however; we were well above their glide path. The wind at altitude was almost calm. I don't know how this could have been prevented. I believe the wake was from another aircraft. It would be almost impossible for it to be the preceding aircraft. The calm winds and topography may have allowed wake to remain in place longer than normal from another airplane ahead of the B767 we were following.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737-300 first officer reported encountering wake turbulence on arrival to lax that resulted in a 45 degree roll.